Drawing die



g- 20, 9 H. H. RICHARDSON 2,012,022

DRAWING DIE Filed April 29, 1935 2 Sheets- Sheet l HARE) HAM/Z 70/V E/[HAPDSO/V Cttornegs Ihwentor Aug. 20, 1935.

H. H. RICHARDSON DRAWING DI E 2 Sheets-Sheet 2 Filed April 29, 1935 Imoentor HARP) HAN/l TON RICH/1 PDSO/V W TM -(Ittornegs Patented Aug. 20, 1935 nnawme pm Harry Hamilton Richardson, Hamilton, Ontario, Canada, assignor to Union Drawn Steel Company, Massillon, Ghio, a corporation of Pennsylvania Application April 29;, 1935, Serial No. 1am

s onions. (oi. zen-2s) This invention relates to drawingdies for formblocks are indicated at A and ing and/or working elongated polygonal metal side blocks at C and D.

shapes such as hot rolled bars. The primary ob- Although the die blocks may be constructed ject of the invention contemplates the provision with difierent over-all dimensions to accommo- 5 of an improved die which will obtain polygonal date their securement in the die housing, the 55' shapes of uniform cross section having well filled working face of each die block is the same, as sharp edges or corners. will be noted in Figures 1 and 3. The portion of An example of one of the uses to which the the working face oi each die block which defines improved die has been applied to advantage is in the throat or mouth of the die is formed with a. salvaging deffe'ctive square and hexagonal bar tapered axial convexity 'i which is preferably but to stock from the hot mill. Frequently such maot n c ssa ly substantially wedgep in te'rial leaves the mill with slightly rounded and/or Cross Se t formed With an x el dg to unfilled corners which are objectionable for oer p in e a p owing or spreadin ct o tain classes of commercial use. By reworking of the surface meta and e t O1 eli rlide the material so worked into the corners of the die. 35

B, and the two this defective stock in the improved die the lineal edges thereof will be straightened, the corners This axial ridge convex p en 0f the die well filled and the material will be thus condier -d a y eor ap n a p an r flat tioned for use. It will be understood that the Surface 8 in each i h die Segments, thus deimproved die comprehends use not only for the fining Perfect Square in the die Opening P p reclamation of defective stock, but may he used at the Point Where the bar is drawn to its as in the initial drawing process, since the design of l Shape The r arw rd portion t of the workthe die insures polygonal sections 0! more fully s a of each die block s p e e ably relieved t developed edges and more sharply defined corflare d y. 8 tfthe Outlet 0f the die ners than has been possible with prior known assembly w Provide clearance for metal types of dies, during the drawing operation as shown in Fig. 2. 25

The foregoing and other objects and advan- The blocks a retained in t e die housins t .tages of the improved die will become apparent by Wedges It w be n r h w v in view of the following description taken in conthat the manner of locking the d e blocks as junction it th drawings, wherein; shown herein is merely illustrative and that oth- Figure 1 is a view in end elevation looking toforms of anchorage may be p y W th u to wards the inlet end of the die; I departing from the spirit of the present inven- Figure 2 is a central longitudinal sectional view tion- To avoid displfleement 0f he blo ks in astaken substantially on the line 2-2, Figure 1; sembled position, the side membersC and D of the Figure 3 is a substantially central transverse die are Preferably formed w h longitudinal con- 85 sectional view taken on the line 3-3, Figure 2; cave f s H, while the upper and lower blocks A 85 Figure 4 is aperspectlve view of the die segand B are of complemental configuration for enments or .blocks in assembled relation; e s ment ther with. Figures 5, 6 and '1 are detail views in plan, end h Shellie 0f the die p n d y the d and side elevation, respectively, of one of the die Segments bloeks Will be readily pparent from 40 segments or blocks v 7 Figures 1 and 4. The mouth of the die 18 flared. 40

Fi ure 81 a, perspective i of one 1 t the working face of each die block within the l and v mouth of the die presenting a convex or generallfa Figures 9 and 10 are perspective views or pieces Wedge-Shelled suriece wh h merges into a flat or of b t k showing t tt before and after transverse lineal surface 8 at a point adjacent the working, die opening proper. As shown the suriace within 45 A support, or housing 1 h wn t 5 having an the zone in which the convexity of the die merges opening a th i i d n t w segments or with the flat surface is V shaped. However, the blocks forming the die assembly are positioned. whflglhetion 0! the die at this Point may Very These die blocks or segments are preterably or. with the manner of side relief or the form of so ranged so that there is one segment or block for convexity of the Beyond the die p nin each side of the bar tobe formed or shaped. Thus P p most constricted Opening in the d e. the where the shape to b given th is square, surfaces flare outwardly to clear the bar, note there will be four die segments or blocks, as is Particularly F g shown in the embodiment used for illustrative F 9 Shows e Piece Of bar Stock h vin d5 purposes in the drawings. The upper and lower rounded and unfilled corners and being other- 2 wise more or less deformed. As such stock approaches the die opening proper the metal in the side walls of thebar stock will first engage the convex surface of the die, then as the bar is advanced into the constricted die opening the metal {in the sidewalls of the bar will be crowded or ,extruded into the corners of the die, the metal in each surface of the bar being forced from the medial axis of the bar outwardly to the corner edge thereof as shown in the finished bar l3, Fig. 10. When the bar reaches the constricted proved die, the only change necessary for ap-' plication being the, appropriate number of die blocks in the die assembly. In some forms of stock a bar could .be' satisfactorily rectified or worked by a die assemblywhereln some of the die blocks were formed with plane or fiat working surfaces while other of the die blocks are formed with the improved convex surface. An example of such application would be in a bar of a semicircular section with a fiat base portion.

Although the foregoing sets forth a theory of operation of the improved die with respect to the working of the metal, it is to be understood that such theory is not to be considered as a limitation, since it is given from impressions received from viewing the die in operation and the resultant product, and not from-examination of etched sections or other and similar means of study of the. metal during the various phases of working.

It should also be understood that certain 'minor changes may be adopted within the scope of the invention as defined by the-appended claims.

1. A die for. drawing polygonal-shaped elongated metal sections, such as bar stock, having a flared inlet with a working face for each face of the bar to be drawn formed with an axial convexity which merges into a plane surface in the die opening proper.

2. A die for drawing polygonal-shaped elongated metal sections, such asbar stock, having'a flared mouth with a working face for each face of the bar to be drawn formed with an axial ridge which, upon reaching the die opening proper, merges into a plane surface.

.3. A die for drawing polygonal metal sections. such as hot rolled bar stock, having a bell shapd mouth defined by 'a plurality of working faces each of which is formed with a central convex portion extending axially of the face, said convex portion being flattened into a plane surface upon reaching the die opening proper, and together with the remaining die surfaces forming a sharply defined opening configured in the shape of the finished section.

4. A die for drawing polygonal-shaped elongated metal sections, such as bar stock, having a bell-shaped inlet defined by a plurality of working faces one for each face of the polygon, each face being formed with a convexity which merges into a plane surface at the die-opening proper, the outlet of the die beyond the said die opening proper being flared outwardly to clear the bar.

5. In a drawing die for shaping fiat-sided elongated metal sections, such'as hot rolled bar stock, means at the mouth of the die for extruding the surface metal along each face of the section at divergent angles into the corners of the die to insure a well filled-section having sharply defined comers.

6. A die block for a drawing die having a working face formed with an axial convexity which merges into a plane surface.v

HARRY HAMILTON RICHARDSON. 

